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Ref. 185040646 MR730/720/700/480 Technical Manual ¯ Revision F ¯ Issued March 2001
2.6 WARM UP MODE
After initial turn on, warm up mode is entered. In this mode the Low temperature alarm is disabled. The Low temperature alarm is
enabled when warm up mode is exited.
2.6.1 WARM UP MODE EXITING CONDITIONS (LOW TEMPERATURE ALARM ENABLED):
• (MR700/MR730(All versions) and MR720(version 1.0) in Heater Wire Mode)
Warm Up mode continues until the Software Detects-
Either: The airway temperature reaches within 0.8 °C of the Temperature Control set point.
Or: The airway temperature has not increased by 2 °C for at least 4 minutes (2 minutes for version 3.0 software).
Or: The airway temperature has not got within 2 °C of the set point after ten minutes from switch on.
• (MR700/MR730(all versions) and MR720(version 1.0) in Non Heater Wire Mode and MR480)
Warm Up mode continues until the Software Detects-
Either: The airway temperature gets above 30 °C.
Or: The airway temperature has not increased by 2 °C within 15 minutes.
Or: The airway temperature has increased by 2 °C within 15 minutes but still has not reached 30 °C after a further 15
minutes.
Note:In this mode the audio alarm is not enabled until 30 seconds after the Airway Temp Low LED switches on.
At this time the heaterplate circuit switches off, pressing mute will silence the alarm for 10 minutes, during
which time the heaterplate power is enabled
2.6.2 MR720 (VERSION 2.0, 3.0 SOFTWARE)
If the above warm up exiting conditions are not initially met the MR720 will automatically enter the standby mode for 20
minutes for version 2.0 software and 30 minutes for version 3.0 software (refer § 2.7.2).
2.7 STANDBY MODE
2.7.1 MR700/MR730 (ALL SOFTWARE VERSIONS), MR720 (VERSION 1.0 ONLY)
The standby mode can be entered or exited by depressing the standby button for 1 second. A beep will be emitted once
successful entered or exited standby mode (refer § 2.2.3).
In the standby mode all Low Temperature alarms are inhibited, the heaterplate is controlled to a nominal 40.0 °C and the
heater wire is on a 15 % duty cycle.
Standby mode is automatically exited after 20 minutes (30 minutes for version 3.0 software) and the warm up mode is
entered (the low temperature alarms remain disabled - refer § 2.6).
A Remote Standby request (see Appendix A5.3) enables the standby mode and turns the standby amber LED permanently on.
2.7.2 MR720 STANDBY MODE (VERSION 2.0 AND 3.0 SOFTWARE ONLY)
The MR720 has a special feature where it will go into a standby mode automatically after turn on if the warm up exiting
conditions are not met. This standby mode time is 20 minutes for version 2.0 and 30 minutes for version 3.0 software.
While in standby mode, if the airway temperature increases by 2 °C at any time, the MR720 will exit stand by mode and
enter warm up mode. The unit then monitors the warm-up exiting conditions(see § 2.6.1 and 2.6.2), and if these are not
met, then the unit re-enters Standby mode.